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You want a 720nm for the best effect on films available now, higher and it'll be hard work getting an image and higher than 760 and you won't get one. (I haven't tested but this is what data sheets and people on the internet say.)
I use a Fuji gel filter cut to size and mounted in a regular filter with the glass taken out (it was cheaper than a regular filter and probably better quality than most of the not super expensive ones). Don't know if they're available/cheap in the UK but maybe there's something similar.
shinkuu_kiss
alright, what about infrared filters, which one are you using?
just got a book from the library, trying to figure out some basics